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2 years ago

Factorise completely a). 3xy - 9x b). x² - 4 c). 2x² + 5y + 1

Mathematics

1 answer:

Keith_Richards [23]2 years ago

8 0

Answer:

a) 3x(y-3)

b) (x-2)(X+2)

Step-by-step explanation:

See the steps below:) You can also use the app photo math, you take a picture and it will give you the answer and explain the steps:)

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The table shows the temperature (y) at different altitudes (x).

Shtirlitz [24]

Answer/Step-by-step explanation:

2. Using two pairs of values, (0, 59) and (2,000, 51),

$slope (m) = \frac{y_2 - y_1}{x_2 - x_1} = \frac{51 - 59}{2,000 - 0} = \frac{-8}{2,000} = -\frac{1}{250}$

3. The y-intercept is the value of y when x = 0. Thus, x = 0, when y = 59. Therefore,

y-intercept (b) = 59

4. To write an equation in slope-intercept form, simply substitute m = -¹/250, and b = 59, in $y = mx + b$

✅ $y = -\frac{1}{250}x + 59$

5. Substitute x = 5,000 in $y = -\frac{1}{250}x + 59$ .

$y = -\frac{1}{250}(5,000) + 59$

$y = -20 + 59$

$y = 39$

At an altitude of 5,000 ft, temperature would be 39°F

3 0

2 years ago

Slope and rate of changes describe the same value true or false

Anit [1.1K]

Answer:

True

Step-by-step explanation:

“Rate of change” means the same as “slope.” If you are asked to find the rate of change, use the slope formula or make a slope triangle.

8 0

2 years ago

What is the value of x in the equation of 3x-47=65 when y=4

cluponka [151]

Step-by-step explanation:

3x-47=65

3x=65+47

3x=112

x=37.3

5 0

3 years ago

Read 2 more answers

The slope between (-3,5) and (6, -4)

gregori [183]

Answer:

-1

Step-by-step explanation:

4 0

2 years ago

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Please show the work as well 5TH GRADE MATH

Liono4ka [1.6K]

Answer:

$9450 {m}^{3}$

Step-by-step explanation:

Given ,

Length of the tank = 27m

Width of the tank = 35m

Depth of the tank = 10m

Therefore, 

Volume of the tank = Length × Width × Depth

= 27m × 35m × 10m

$= 9450 {m}^{3} (ans)$

3 0

2 years ago

Read 2 more answers

Factorise completely a). 3xy - 9x b). x² - 4 c). 2x² + 5y + 1​

Factorise completely a). 3xy - 9x b). x² - 4 c). 2x² + 5y + 1